1235 Aluminum Foil

People shopping for 1235 aluminum foil often ask similar questions on Google and QandA communities, especially about purity, temper, safety, and defect control. Below are 5 of the most frequently asked, high intent questions seen recently, with practical answers written for first time purchasers evaluating material and suppliers.

1. What is 1235 aluminum foil, and how is it different from 8011 or 3003?

1235 is a commercially pure aluminum alloy, typically around 99.35 percent Al, with the remainder mainly controlled Fe and Si. In foil applications, that high purity matters because it generally brings good ductility, stable forming behavior, and strong surface brightness when rolled well.

Compared with 8011, 1235 usually has slightly higher electrical and thermal conductivity and can be easier to achieve very thin gauges with good elongation. 8011 contains more alloying elements, which can improve strength and some processing windows, so many converters choose between them based on forming, coating, or downstream performance.

Compared with 3003, 1235 is much softer at the same temper and is used far more often for flexible packaging and lamination structures. 3003 has manganese for higher strength and is more common where stiffness is desired.

A fast way to choose:

2. Is 1235 aluminum foil food safe, and what certificates should I ask for?

1235 aluminum foil can be suitable for food contact, but food safe is not just the alloy number. Safety depends on rolling oils, cleaning and annealing practices, surface residue, and whether the final product complies with the regulations in your target market.

Common buyer questions include whether it is safe for cooking, wrapping, and direct contact. In most normal uses, aluminum foil is widely used for food contact globally, but you should request documentation aligned to your destination:

• A declaration of compliance for food contact requirements, based on the region you sell into.
• Test reports for surface cleanliness or residual oil if your process is sensitive.
• Packaging and storage conditions, because odor pickup can happen if foil is stored near solvents.

Practical tip: Ask your supplier to state the intended application, such as food packaging lamination or household use, and provide a matching compliance statement. Also confirm whether one side is treated, coated, or printed, since coatings have their own compliance requirements.

3. What temper should I choose: 1235-O, H18, or something in between?

Temper is one of the most searched topics because it directly affects forming, stiffness, and how the foil behaves on a converter line.

• 1235-O is fully annealed, soft foil. It is commonly chosen for deep forming, embossing, folding, and lamination where you want good elongation and low risk of cracking.
• 1235-H18 is full hard foil. It is used when you need higher stiffness, better shape retention, and faster high speed handling, but it is less forgiving in severe forming.
• Intermediate tempers like H14, H16, or custom process windows may be offered depending on the mill and thickness.

A simple selection checklist:

When quoting, provide not only temper but also target thickness and width, core ID, max OD, and whether you need one side matte or both sides bright. Those details often change the achievable flatness and defect rate more than buyers expect.

If you are sourcing for energy storage related structures, compare specs with purpose built products like 1235 Aluminum Foil For Lithium Ion Battery and broader category options like Ev battery foil, since battery grade expectations for cleanliness and consistency are typically stricter than general packaging.

4. How do I control pinholes, thickness tolerance, and surface defects in thin 1235 foil?

This is a hot QandA topic because thin foil performance is often decided by defect control rather than the alloy name.

Pinholes and breaks can come from inclusions, rolling issues, rough handling, or poor tension control. For thin gauges, ask your supplier to clarify:

• Pinhole inspection method, such as light table testing or automated detection.
• Allowable pinhole count per square meter at your specified thickness.
• Thickness tolerance standard and how it is measured, since online gauges and lab micrometers can differ.
• Surface requirements, such as oil level, stains, roll marks, scratches, and edge cracks.

Also confirm the packaging: moisture barrier wrap, desiccant, and edge protection. Many complaints come from transportation damage rather than production.

A practical RFQ line item set that reduces disputes:

5. What are typical thicknesses, widths, and MOQ expectations for 1235 aluminum foil?

Recent searches commonly ask for the most orderable ranges and what mills will actually quote without excessive lead time.

Typical commercially available thickness ranges can run from very thin microns for flexible packaging up to heavier gauges for household and industrial uses. Availability depends on the mill, the required temper, and whether you need jumbo rolls or small rolls.

Width capability depends on the rolling mill and slitting capacity. If you need narrow widths, clarify the number of slits, minimum slit width, and whether you need tight width tolerance for automatic splicing.

MOQ is often driven by:

• Whether the mill has your exact thickness and temper in routine production.
• How many slit widths you need from one master roll.
• Packaging format, such as export pallets, core type, and roll weight.

To speed up supplier evaluation, send a quote request that includes:

• Alloy 1235, temper, thickness, width, and roll length or roll weight.
• Application, such as lamination, household, pharma, or industrial.
• Quality requirements, especially pinholes, cleanliness, and flatness.
• Delivery terms and destination port.

Quick comparison: what you should ask before placing the first order

These questions reduce the risk of receiving foil that looks correct but runs poorly on your line.